Nothing, really. Semen color and consistency vary from person to person, and even for one person it can vary over time. Contrary to popular belief, having milky semen does not necessarily mean you are more fertile or "potent" than someone with clearer semen. (For more, read JackinQ&A – Questions About Semen & Ejaculation.)
Do you enjoy any anal stimulation while masturbating? If so, do you use anything other than your fingers?
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My semen is clear, not white like other semen I've seen. What does this mean?
